University:
North Idaho College
Course:
PHYS-211 | Engineering Physics I
Academic year:

2023
Views:

201

Pages:

4
Author:

Hani T.

Photoelectric Effects The emission of electrons from a metal when a beam of light of sufficiently high energy strikes its surface is known as the photoelectric effect. The surface from which the electrons are ejected is the emitter, while the current collector serves to measure the electron flux. In order to reach the current collector from the emitting surface The electrons need to have the required kinetic energy, for example if UV light is allowed to strike metals such as K, Cs or Pt, this effect is more pronounced. The salient experimental observations of the photoelectric effect are as follows: The intensity of the light has no effect on max velocity of the photoelectrons. The frequency of the light directly influences the max. velocity of the electrons emitted. The rate at which the photoemission occurs is directly proportional to the intensity of light. For a given metal, there exists a threshold frequency above which the photoelectric effect occurs.